WO2011071969A1 - A porous, dissolvable solid substrate and a cationic surfactant conditioner material - Google Patents
A porous, dissolvable solid substrate and a cationic surfactant conditioner material Download PDFInfo
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- WO2011071969A1 WO2011071969A1 PCT/US2010/059365 US2010059365W WO2011071969A1 WO 2011071969 A1 WO2011071969 A1 WO 2011071969A1 US 2010059365 W US2010059365 W US 2010059365W WO 2011071969 A1 WO2011071969 A1 WO 2011071969A1
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- personal care
- porous dissolvable
- care article
- dissolvable solid
- solid substrate
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q5/00—Preparations for care of the hair
- A61Q5/02—Preparations for cleaning the hair
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/02—Cosmetics or similar toiletry preparations characterised by special physical form
- A61K8/0216—Solid or semisolid forms
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
- A61K8/41—Amines
- A61K8/416—Quaternary ammonium compounds
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
- A61K8/44—Aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated derivatives thereof
- A61K8/442—Aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated derivatives thereof substituted by amido group(s)
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/46—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing sulfur
- A61K8/463—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing sulfur containing sulfuric acid derivatives, e.g. sodium lauryl sulfate
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/81—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- A61K8/8129—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers or esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers, e.g. polyvinylmethylether
Definitions
- the present invention relates to personal care compositions, especially those personal care compositions providing conditioning benefits in the form of an article comprising a porous dissolvable solid substrate and a cationic surfactant conditioner active.
- Personal care compositions particularly cleansing and conditioning compositions, have traditionally been marketed as being either a cleansing composition or a conditioning composition. While these independent compositions had such cleansing and conditioning benefits as to be acceptable to consumers, there remained a need for a two-in-one cleansing and conditioning composition. As a result, various "two-in-one" compositions were created. However, new conditioning actives had to be created for these two-in-one compositions, as the traditional conditioning actives (i.e. cationic surfactant conditioners) interacted negatively with the anionic surfactants included in the shampoo/cleaning products for foaming. These new conditioning actives did not necessarily reproduce the conditioning benefit that was achieved by the traditional conditioning actives (i.e. cationic surfactant conditioners).
- the traditional conditioning actives i.e. cationic surfactant conditioners
- a method for processing a porous dissolvable solid substrate comprising a cationic surfactant conditioner whereby said process allows for late stage differentiation.
- the acationic surfactant conditioner active can be added and modified without changing the basic formula of the cleansing composition.
- a porous dissolvable solid substrate that contains a cationic conditioner active, a cleaning level of an anionic surfactant, and additional actives including but not limited to perfumes.
- the present invention meets the aforementioned needs.
- the present invention provides a porous dissolvable solid substrate in the form of a unit dose personal care article that can be conveniently and quickly dissolved in the palm of the consumer's hand to reconstitute a liquid personal care composition for ease of application to hair while providing the consumer desired levels of both anionic cleansing surfactants and a cationic surfactant conditioner.
- the present invention provides a personal care article comprising (1) a porous dissolvable solid substrate comprising from about 10% to about 75% anionic surfactant, from about 10% to about 50% water-soluble polymer, from about 1% to about 30% plasticizer; and (2) a surface resident coating comprising from about 10% to about 100% of one or more cationic surfactant conditioner actives; wherein the ratio of the porous dissolvable solid substrate to the surface resident coating is from about 110: 1 to about 0.5:1.
- the present invention provides a method for making the personal care article, comprising: (1) Preparing a processing mixture comprising from about 5% to about 50% anionic surfactant(s), from about 5% to about 35% water-soluble polymer, and from about 0.5% to about 20% plasticizer; (2) Aerating the processing mixture by introducing a gas into the processing mixture to form an aerated wet mixture; (3) Forming the aerated wet mixture into one or more desired shapes; (4) Drying the aerated wet mixture to form a porous dissolvable solid substrate; and (5) Applying a surface resident coating of the cationic surfactant conditioner active in powdered form to the porous dissolvable solid substrate.
- personal care composition means a composition that may be applied to mammalian hair and skin without undue undesirable effects.
- the resulting surface resident coating minimizes the physical interactions between the incorporated cationic surfactant conditioner and the anionic surfactants present within the bulk of the dissolvable porous solid over the shelf life of the product, and before the personal care article is put in contact with water during consumer use.
- personal care article means the porous dissolvable solid substrate comprising an anionic surfactant, water-soluble polymer, and plasticizer, and the surface resident coating comprising a cationic surfactant conditioner active.
- the personal care article may be referred to herein as "the article.”
- porous dissolvable solid substrate means a solidpolymer-containing matrix that defines an interconnected network of spaces or cells that contain the gas of the surrounding atmosphere, typically air.
- the interconnectivity of the structure may be described by a Star Volume, a Structure Model Index (SMI) or a Percent Open Cell Content.
- SI Structure Model Index
- the personal care article of the present invention delivers unique hair conditioning benefits to the consumer from a lathering/cleansing product by enabling the simultaneous and effective delivery of both anionic surfactants and cationic surfactant conditioners from the same unit dosage product.
- the cationic surfactant conditioner active is incorporated as a surface resident coating on the porous dissolvable solid substrate rather than adding the cationic surfactant conditioner active to the continuous solid structure of the porous dissolvable solid substrate during the making process.
- Any suitable application method can be used to apply the cationic surfactant conditioner active to the porous dissolvable solid substrate to form a surface resident coating that is adsorbed to at least a portion of the solid/air interface of the porous dissolvable solid substrate.
- the cationic conditioner active is a powder coating, which is applied to the surface of the porous dissolvable solid substrate.
- cationic surfactant conditioner actives i.e., alkyl quaternary ammonium salts and alkyl amine salts
- anionic surfactants when cationic surfactant conditioner actives (i.e., alkyl quaternary ammonium salts and alkyl amine salts) and anionic surfactants are combined together in a composition they can complex out. This may result in reduced cleansing and conditioning benefits for the personal care article. While this may still occur in the present inventive personal care articles as they are dissolved in water prior to application to the hair, such chemical interactions are minimized when the personal care articles are made and/or used according to the present invention.
- the porous dissolvable solid substrate comprises an anionic surfactant, a water-soluble polymer, and a plasticizer.
- the porous dissolvable solid substrate can be prepared such that it can be conveniently and quickly dissolved in the palm of the consumer resulting in a liquid personal care composition. Once dissolved, this personal care composition can be used in a manner similar to a conventional liquid personal care composition, i.e. applied to the scalp and/or hair. It has been found that such porous dissolvable solid substrate can now deliver lather similar to that of today's liquid personal care compositions.
- the porous dissolvable solid substrate has a maximum Cell Wall Thickness.
- the porous dissolvable solid substrate has a Cell Wall Thickness of from about from about 0.02 mm to about 0.15 mm, in one embodiment from about 0.025 mm to about 0.12 mm, in another embodiment from about 0.03 mm to about 0.09 mm, and in still another embodiment from about 0.035 mm to about 0.06 mm.
- the porous dissolvable solid substrate has a minimum level of interconnectivity between the cells, which is quantified by both the Star Volume, the Structure Model Index (SMI), and the Percent Open Cell Content.
- SI Structure Model Index
- the porous dissolvable solid substrate has a Star Volume of from about 1 mm 3 to about 90 mm 3 , in one embodiment from about 1.5 mm 3 to about 60 mm 3 , in another embodiment from about 2 mm 3 to about 30 mm 3 , and in still another embodiment from about 2.5 mm 3 to about 15 mm 3 .
- the porous dissolvable solid substrate has a non-negative Structure Model Index of from about 0.0 to about 3.0, in one embodiment from about 0.5 to about 2.75, and in another embodiment from about 1.0 to about 2.50.
- the porous dissolvable solid substrate has a Percent Open Cell Content of from about 80% to 100%, in one embodiment from about 85% to about 97.5%, and in another embodiment from about 90% to about 95%.
- the porous dissolvable solid substrate also has a minimum Specific Surface Area.
- the porous dissolvable solid substrate has a Specific Surface Area of from about 0.03 m 2 /g to about 0.25 m 2 /g, in one embodiment from about 0.035 m 2 /g to about 0.22 m 2 /g, in another embodiment from about 0.04 m 2 /g to about 0.19 m 2 /g, and in still another embodiment from about 0.045 m 2 /g to about 0.16 m 2 /g.
- the porous dissolvable solid substrate has a basis weight of from about 125 grams/m 2 to about 3,000 grams/m 2 , in one embodiment from about 300 grams/m 2 to about 2,500 grams/m 2 , in another embodiment from about 400 grams/m 2 to about 2,000 grams/m 2 , in another embodiment from about 500 grams/m 2 to about 1,500 grams/m 2 and in another embodiment from about 600 grams/m 2 to about 1,200 grams/m 2 , and in another embodiment from about 700 to about 1,000 grams/m 2
- the porous dissolvable solid substrate has a solid density of from about 0.03 g/cm 3 to about 0.40 g/cm 3 , in one embodiment from about 0.05 g/cm 3 to about 0.35 g/cm 3 , in another embodiment from about 0.08 g/cm 3 to about 0.30 g/cm 3 , in another embodiment from about 0.10 g/cm 3 to about 0.25 g/cm 3 , and in another embodiment from about 0.12 g/cm 3 to about
- the porous dissolvable solid substrates comprise one or more anionic surfactants from about 10% to about 75% by weight of the porous dissolvable solid substrate of surfactant, in one embodiment from about 30% to about 70%, and in another embodiment from about 40% to about 65% by weight of the personal care article, and in still another embodiment from about 45% to about 60% by weight of the personal care article.
- Anionic surfactants suitable include those described in McCutcheon' s Detergents and Emulsifiers, North American Edition (1986), Allured Publishing Corp.; McCutcheon' s, Functional Materials, North American Edition (1992), Allured Publishing Corp.; and U.S. Patent 3,929,678 (Laughlin et al.).
- suitable anionic surfactants are included in U.S. Serial No. 61/120,790.
- Alkyl and alkyl ether sulfates suitable for use herein include materials with the respective formula ROSO3M and RO(C2H40) x SC>3M, wherein R is alkyl or alkenyl of from about 8 to about 24 carbon atoms, x is 1 to 10, and M is a water-soluble cation such as ammonium, sodium, potassium and triethanolamine.
- the alkyl ether sulfates are typically made as condensation products of ethylene oxide and monohydric alcohol's having from about 8 to about 24 carbon atoms. In one embodiment, R has from about 10 to about 18 carbon atoms in both the alkyl and alkyl ether sulfates.
- Useful alcohols can be derived from fats, e.g., coconut oil or tallow, or can be synthetic.
- Lauryl alcohol and straight chain alcohol's derived from coconut oil are used.
- such alcohol's are reacted with about 1 to about 10, in another embodiment from about 3 to about 5, and especially about 3, molar proportions of ethylene oxide and the resulting mixture of molecular species having, for example, an average of 3 moles of ethylene oxide per mole of alcohol, is sulfated and neutralized.
- Alkyl ether sulfates are those comprising a mixture of individual compounds, said mixture having an average alkyl chain length of from about 10 to about 16 carbon atoms and an average degree of ethoxylation of from about 1 to about 4 moles of ethylene oxide.
- At least one of the one or more water-soluble polymers is chosen such that about 2% by weight solution of the water-soluble polymer gives a viscosity at 20°C of from about 4 centipoise to about 80 centipoise; in an alternate embodiment from about 5 centipoise to about 70 centipoise; and in another embodiment from about 6 centipoise to about 60 centipoise.
- the water-soluble polymer(s) of the present invention can include, but are not limited to, synthetic polymers as described in U.S. Serial No. 61/120,786 including polymers derived from acrylic monomers such as the ethylenically unsaturated carboxylic monomers and ethylenically unsaturated monomers as described in US 5,582,786 and EP-A-397410.
- the water-soluble polymer(s) which are suitable may also be selected from naturally sourced polymers including those of plant origin examples which are described in U.S. Serial No. 61/120,786. Modified natural polymers are also useful as water-soluble polymer(s) in the present invention and are included in U.S. Serial No. 61/120,786.
- water-soluble polymers of the present invention include polyvinyl alcohols, polyacrylates, polymethacrylates, copolymers of acrylic acid and methyl acrylate, polyvinylpyrrolidones, polyalkylene oxides, starch and starch derivatives, pullulan, gelatin, hydroxypropylmethylcelluloses, methycelluloses, and carboxymethycelluloses.
- water-soluble polymers of the present invention include polyvinyl alcohols, and hydroxypropylmethylcelluloses.
- Suitable polyvinyl alcohols include those available from Celanese Corporation (Dallas, TX) under the CELVOL® trade name.
- Suitable hydroxypropylmethylcelluloses include those available from the Dow Chemical Company (Midland, MI) under the METHOCEL® trade name including combinations with above mentioned hydroxypropylmethylcelluloses.
- the above mentioned water-soluble polymer(s) may be blended with any single starch or combination of starches as a filler material in such an amount as to reduce the overall level of water-soluble polymers required, so long as it helps provide the personal care article with the requisite structure and physical/chemical characteristics as described herein.
- the combined weight percentage of the water-soluble polymer(s) and starch-based material generally ranges from about 10% to about 50%, in one embodiment from about 15% to about 40%, and in a particular embodiment from about 20% to about 30% by weight relative to the total weight of the porous dissolvable solid substrate.
- the weight ratio of the water-soluble polymer(s) to the starch-based material can generally range from about 1:10 to about 10:1, in one embodiment from about 1:8 to about 8:1, in still another embodiment from about 1:7 to about 7:1, and in yet another embodiment from about 6:1 to about 1:6.
- Typical sources for starch-based materials can include cereals, tubers, roots, legumes and fruits.
- Native sources can include corn, pea, potato, banana, barley, wheat, rice, sago, amaranth, tapioca, arrowroot, canna, sorghum, and waxy or high amylase varieties thereof.
- the starch- based materials may also include native starches that are modified using any modification known in the art, including those described in U.S. Serial No. 61/120,786.
- the porous dissolvable solid substrate of the present invention comprises a water soluble plasticizing agent suitable for use in personal care compositions.
- the one or more plasticizers may be present from about 1% to about 30% by weight of the porous dissolvable solid substrate; in another embodiment from about 3% to about 25%; in another embodiment from about 5% to about 20%, and in yet another embodiment, from about 8% to about 15%.
- suitable plasticizing agents include polyols, copolyols, polycarboxylic acids, polyesters and dimethicone copolyols.
- polyols examples include, but are not limited to, glycerin, diglycerin, propylene glycol, ethylene glycol, butylene glycol, pentylene glycol, cyclohexane dimethanol, hexane diol, polyethylene glycol (200-600), sugar alcohols such as sorbitol, manitol, lactitol and other mono- and polyhydric low molecular weight alcohols (e.g., C2-C8 alcohols); mono di- and oligo-saccharides such as fructose, glucose, sucrose, maltose, lactose, and high fructose corn syrup solids and ascorbic acid.
- sugar alcohols such as sorbitol, manitol, lactitol and other mono- and polyhydric low molecular weight alcohols (e.g., C2-C8 alcohols); mono di- and oligo-saccharides such as fructose, glucose, sucrose, maltose
- the plasticizers include glycerin or propylene glycol and
- the porous dissolvable solid substrate may further comprise other optional ingredients that are known for use or otherwise useful in personal care compositions, provided that such optional materials are compatible with the selected essential materials described herein, or do not otherwise unduly impair the performance of the personal care composition.
- Such optional ingredients are most typically those materials approved for use in cosmetics and that are described in reference books such as the CTFA Cosmetic Ingredient Handbook, Second Edition, The Cosmetic, Toiletries, and Fragrance Association, Inc. 1988, 1992. Examples of such optional ingredients are disclosed in U.S. Serial No. 12/361,634.
- non-anionic surfactants may include nonionic surfactants, cationic surfactants, zwitterionic surfactants, amphoteric surfactants, or combinations thereof. Examples of these non-anionic surfactants can be found in U.S. Serial No. 61/120,786.
- the porous dissolvable solid substrates provide a continuous and accessible high surface area "scaffold" (a 3-D network of "struts") for the surface resident coating comprising the cationic surfactant conditioner active to be adsorbed or distributed acrosscreating a high surface area thin coating that is physically isolated from the anionic surfactants present within the bulk of "struts" It is believed that this coating approach minimizes the opportunity for the cationic surfactant conditioner active to contact anionic surfactants and encounter negative physical interactions (complexation, precipitation, ion pairing etc.) which facilitates greater cationic surfactant conditioner active deposition efficiency and increased conditioning benefits as well as improved lather performance.
- the surface resident coating comprises from about 10% to about 100% of one or more cationic surfactant conditioner actives; in another embodiment from about 25% to about 100%, and in yet another embodiment from about 40% to about 100%.
- the ratio of the porous dissolvable solid substrate to the surface resident coating comprising the cationic surfactant conditioner active is from about 110:1 to about 0.5: 1, in another embodiment from about 20:1 to about 1:1, in another embodiment from about 10: 1 to about 1.5:1, and in yet another embodiment from about 7:1 to about 3:1.
- Suitable cationic surfactant conditioner actives for use in compositions of the invention contain amino or quaternary ammonium hydrophilic moieties which are positively charged when dissolved in the composition.
- the aliphatic groups can contain, in addition to carbon and hydrogen atoms, ether linkages, and other groups such as amino groups.
- the longer chain aliphatic groups e.g., those of about 12 carbons, or higher, can be saturated or unsaturated and can be branched or unbranched.
- the class of cationic conditioner actives of general formula (I) R 1 and R 2 are each independently selected from Ci 6 to C 22 hydrocarbyl chains comprising at least one ester linkage in both R 1 and R 2 , and R 3 and R 4 are each independently selected from CH 3 and
- the class of cationic conditioner actives of general formula (I), R 1 and R 2 are each independently selected from Ci 6 to C 22 saturated or unsaturated, and R 3 and R 4 are each independently selected from CH 3i CH 2 CH 2 OH, and CH 3 .
- the class of cationic conditioner actives of general formula (I), R 1 is a Ci 6 to C 22 alkyl chain and R 2 , R 3 and R 4 are each independently selected from CH 3 , CH2CH20H, and CH 3 .
- the quaternary ammonium cationic conditioner active is behenyltrimethylammonium chloride (BTMAC).
- Suitable cationic surfactant conditioner actives can include salts of primary, secondary, and tertiary fatty amines.
- the alkyl groups of such amines have from about 12 to about 22 carbon atoms, and can be substituted or unsubstituted. These amines are typically used in combination with an acid to provide the cationic species.
- R 1 C(O)— N(H)—
- R 2 N(R 3 )(R 4 ) in which R 1 is a fatty acid chain containing from 12 to 22 carbon atoms, R 2 is an alkylene group containing from one to four carbon atoms, and R 3 and R 4 are, independently, an alkyl group having from one to four carbon atoms.
- R 1 can be saturated or unsaturated and can be branched or unbranched.
- arachidamidopropyldimethylamine arachidamidopropyldiethylamine
- arachidamidoethyldiethylamine arachidamidoethyldimethylamine
- alkyl amine salts can include dimethylstearamine, dimethylsoy amine, soyamine, myristylamine, tridecylamine, ethylstearylamine, N-tallowpropane diamine, ethoxylated (with 5 moles of ethylene oxide) stearylamine, dihydroxyethylstearylamine, and arachidyl behenylamine.
- the alkyl amine salt is
- stearamidopropyldimethylamine Mixtures of any of the foregoing materials may also be suitable.
- the molar ratio of protonatable amine groups to H + from the acid is from about 1:0.3 to about 1:1.2; and in another embodiment, from about 1:0.5 to about 1: 1.1. Mixtures of any of the above-described cationic conditioner actives may also be suitable.
- the surface resident coating comprising the cationic surfactant conditioner is applied to the porous dissolvable solid substrate in particulate form.
- the surface resident coating comprising the cationic surfactant conditioner active is in the form of a fine powder.
- the personal care article 10 contains a surface resident coating comprising a cationic surfactant conditioner active 12 that is located on at least a portion of the surface of the porous dissolvable solid substrate 14. It will be appreciated that the isolated surface resident coating comprising the cationic surfactant conditioner active 12 may not always be adjacent to the porous dissolvable solid substrate 14. In certain embodiments, the surface resident coating comprising the cationic surfactant conditioner active 12 may permeate the porous dissolvable solid substrate 14 in whole or in part.
- the surface resident coating comprising the cationic conditioner active can be included (e.g., sandwiched or encased) within the personal care article or parts thereof.
- a surface resident coating comprising the cationic surfactant conditioner active can be sprayed, dusted, sprinkled, coated, surface-printed (e.g., in the shape of a desired adornment, decoration, or pattern), poured on, injected into the interior, dipped, or by any other suitable means, such as by use of a depositor, sifter, or powder bed.
- the personal care article 10 contains a surface resident coating comprising the cationic surfactant conditioner active that can be situated below the surface of the porous dissolvable solid substrate.
- the surface resident coating comprising the cationic surfactant conditioner active 24 is located within the dimples 22 of the porous dissolvable solid substrate 26.
- the powder is sandwiched between two porous dissolvable solid substrate which are then joined together (e.g., via sealing the adjoining surfaces or edges with a thin layer of water and/or plasticizer so as to not substantially dissolve the porous dissolvable solid substrate and applied pressure to induce adhesion).
- the personal care article 10 comprises two porous dissolvable solid substrates 16, 18 in between which a surface resident coating comprising the cationic surfactant conditioner active 20 is located.
- the powder may be on one personal care article which is folded over to form a pouch, encasing the powder.
- the personal care article 10 comprises a surface resident coating comprising the cationic surfactant conditioner active 32 that is enclosed within a folded porous dissolvable solid substrate 34.
- the surface resident coating comprising the cationic surfactant conditioning actives of the present invention generally does not spread uniformly across all exposed solid/air interfaces. Rather, the surface resident coatings of the present invention are typically distributed mostly across the outer surface layer of the porous dissolvable substrate from where it is applied and with some particulates distributing into cavities down to about 0.5 to 3 mm according to gravity and the coating process employed.
- the surface resident coating can include additional excipients, for instance for the purposes of improving the flow properties of the powder during application or to serve as a carrier for the cationic surfactant conditioner active or as a filler material.
- excipients can include, but are not limited to, starches, modified starches, talc, silicas (silicon dioxide), silicates, calcium silicate, amorphous silicas, calcium carbonates, magnesium carbonates, sodium aluminosilicates, zinc carbonates, aluminum starch octenylsuccinates, and mixtures thereof.
- the filler material is an aluminum starch octenylsuccinate under the trade name DRY-FLO® PC and available from Akzo Nobel.
- the surface resident coating comprising the cationic surfactant conditioner active can also include additional optional cosmetic actives including perfumes, silicones, cationic polymers, feel modifiers, etc. including any cosmetic active approved for use in cosmetics such as are described in reference books such as the CTFA Cosmetic Ingredient Handbook, Second Edition, The Cosmetic, Toiletries, and Fragrance Association, Inc. 1988, 1992. Examples of such optional ingredients are disclosed in U.S. Serial No. 12/361,634.
- the surface resident coating may also include optional cosmetic active particulate complexes including but not limited to starch perfume matrix microspheres, perfume loaded inorganic absorbent powders, beta cyclodextrin encapsulated perfumes, and combinations thereof.
- the surface resident cationic surfactant conditioner coatings of the present invention can be coated onto a porous dissolvable substrate that does not comprise an anionic surfactant for formulation advantages such as late stage differentiation, to improve product shelf stability, or to decrease formulation complexity etc.
- the porous dissolvable substrate can be comprised of predominantly non-ionic or even cationic surfactants which may otherwise be physically compatible with the cationic surfactant conditioner active.
- the surface resident coating comprising the cationic surfactant conditioner active may be adsorbed to porous dissolvable substrates comprising other types of actives which have potential to negatively interact with the cationic surfactant conditioner active including but not limited to highly charged anionic polymers, anionic particles, anionic dispersions etc.
- the surface resident coating of the present invention may incorporate cationic actives other than cationic or surfactant conditioners including, but not limited to, cationic polymers or cationic dyes dyes. Zwitterionic materials (surfactants, polymers, dyes etc.) are also suitable for incorporation within the surface resident coatings of the present invention.
- cationic polymers examples include cationized cellulose derivatives, cationic starch, cationized guar gum derivatives, homopolymer of diallyl quaternary ammonium salt, diallyl quaternary ammonium salt acrylamide copolymer, quaternized polyvinyl-pyrrolidone derivatives, polyglycol polyamine condensation products, vinylimidazolium
- alkylacrylamide/acrylate/alkylaminoalkylacrylamide/polyethylene glycol methacrylate copolymers adipic acid/dimethylaminohydroxypropyl ethylenetriamine copolymer, and cationic polymers disclosed in JP-A-53139734 and JP-A-60036407.
- Cationic dyes may include those of the azo type, thiazole type, stilbene type,
- anthraquinone type indigoid type, quinacridone type, quinophthalone type, aminoketone type, hydroxyketone type, phthalocyanine type, formazan type, cyanine type, nitro type, nitroso type, diphenylmethane type, tnarylmethane type, xanthene type, acridine type, azine type, oxazine type, thiazine type, indamine type, indophenol type, and lactone types.
- Some examples include, but are not limited to, Basic Blue 6, Basic Blue 7, Basic Blue 9, Basic Blue 26, Basic Blue 41, Basic Blue 99, Basic Brown 4, Basic Brown 16, Basic Brown 17, Basic Green 1, Basic Red 2, Basic Red 22, Basic Red 76, Basic Violet 1, Basic Violet 3, Basic Violet 10, Basic Violet 14, Basic Yellow 11, and Basic Yellow 57 as are described in reference books such as the CTFA Cosmetic Ingredient Handbook, Second Edition, The Cosmetic, Toiletries, and Fragrance Association, Inc. 1988, 1992.
- the personal care article can be produced in any of a variety of product forms, including porous dissolvable solid substrates along with the surface resident coating comprising the cationic surfactant conditioner active used alone or in combination with other personal care components.
- the product form embodiments contemplated herein include the selected and defined personal care article that comprises a combination of a porous dissolvable solid substrate and a surface resident coating comprising a cationic surfactant conditioner ative.
- the personal care article is in the form of one or more flat sheets or pads of an adequate size to be able to be handled easily by the user. It may have a square, rectangle or disc shape or any other suitable shape.
- the pads can also be in the form of a continuous strip including delivered on a tape-like roll dispenser with individual portions dispensed via perforations and or a cutting mechanism.
- the personal care articles are in the form of one or more cylindrical objects, spherical objects, tubular objects or any other shaped object.
- the personal care article may comprise one or more textured, dimpled or otherwise topographically patterned surfaces including letters, logos or figures.
- the textured substrate can result from the shape of the substrate, in that the outermost surface of the substrate contains portions that are raised with respect to other areas of the surface.
- the raised portions can result from the formed shape of the personal care article, for example the personal care article can be formed originally in a dimpled or waffle pattern.
- the raised portions can also be the result of creping processes, imprinted coatings, embossing patterns, laminating to other layers having raised portions, or the result of the physical form of the porous dissolvable solid substrate itself.
- the texturing can also be the result of laminating one porous dissolvable solid substrate to a second porous dissolvable solid substrate that is textured.
- the personal care article can be perforated with holes or channels penetrating into or through the porous solid.
- the personal care article can be prepared by the process comprising: (1) Preparing a processing mixture comprising anionic surfactant(s), dissolved polymer structurant, and plasticizer; (2) Aerating the processing mixture by introducing a gas into the processing mixture to form an aerated wet mixture; (3) Forming the aerated wet mixture into one or more desired shapes; (4) Drying the aerated wet mixture to form a porous dissolvable solid substrate; and (5) Applying the surface resident coating comprising a cationic surfactant conditioner active in powdered form to the porous dissolvable solid substrate.
- the processing mixture is generally prepared by dissolving the polymer structurant in the presence of water, plasticizer and other optional ingredients by heating followed by cooling. This can be accomplished by any suitable heated batch agitation system or via any suitable continuous system involving either single screw or twin screw extrusion or heat exchangers together with either high shear or static mixing. Any process can be envisioned such that the polymer is ultimately dissolved in the presence of water, the surfactant(s), the plasticizer, and other optional ingredients including step-wise processing via pre-mix portions of any combination of ingredients.
- the processing mixtures of the present invention comprise: from about 15% to about 60% solids, in one embodiment from about 20% to about 55% solids, in another embodiment from about 25% to about 50% solids, and in yet another embodiment from about 30% to about 45% solids by weight of the processing mixture before drying; and have a viscosity of from about 2,500 cps to about 150,000cps, in one embodiment from about 5,000 cps to about 100,000 cps, in another embodiment from about 7,500 cps to about 75,000 cps, and in still another embodiment from about 10,000 cps to about 60,000 cps.
- the % solids content is the summation of the weight percentages by weight of the total processing mixture of all of the solid, semi-solid and liquid components excluding water and any obviously volatile materials such as low boiling alcohols.
- the processing mixture viscosity values are measured using a TA Instruments AR500 Rheometer with 4.0 cm diameter parallel plate and 1,200 micron gap at a shear rate of 1.0 reciprocal seconds for a period of 30 seconds at 23°C.
- the aeration of the processing mixture is accomplished by introducing a gas into the mixture. In one embodiment this is done by mechanical mixing energy. In another embodiment this may be achieved via chemical means.
- the aeration may be accomplished by any suitable mechanical processing means, including but not limited to: (i) Batch tank aeration via mechanical mixing including planetary mixers or other suitable mixing vessels, (ii) semi-continuous or continuous aerators utilized in the food industry (pressurized and non-pressurized), or (iii) spray- drying the processing mixture in order to form aerated beads or particles that can be compressed such as in a mould with heat in order to form the porous solid.
- the personal care article can be prepared within continuous pressurized aerators that are conventionally utilized within the foods industry in the production of marshmallows.
- Suitable continuous pressurized aerators include the Morton whisk (Morton Machine Co., Motherwell, Scotland), the Oakes continuous automatic mixer (E.T. Oakes Corporation, Hauppauge, New York), the Fedco Continuous Mixer (The Peerless Group, Sidney, Ohio), and the Preswhip (Hosokawa Micron Group, Osaka, Japan).
- the pre-mixture is pre-heated immediately prior to the aeration process at above ambient temperature but below any temperatures that would cause degradation of the component. In one embodiment, the pre-mixture is kept at above about 40°C and below about 99°C, in another embodiment above about 50°C and below about 95°C, in another embodiment above about 60°C and below about 90°C. In one embodiment, when the viscosity at ambient temperature of the pre-mix is from about 15,000 cps to about 150,000 cps, the optional continuous heating should be utilized before the aeration step. In an another embodiment, additional heat is applied during the aeration process to try and maintain an elevated temperature during the aeration. This can be accomplished via conductive heating from one or more surfaces, injection of steam or other processing means.
- the wet density range of the aerated pre-mixture ranges from about 0.12 g/cm 3 to about 0.50 g/cm 3 , in another embodiment from about 0.15 g/cm 3 to about 0.45 g/cm 3 , in another embodiment from about 0.20 g/cm 3 to about 0.40 g/cm 3 , and in yet another embodiment from about 0.25 g/cm 3 to about 0.35 g/cm 3 .
- the forming of the aerated wet processing mixture may be accomplished by any suitable means to form the mixture in a desired shape or shapes including, but not limited to (i) depositing the aerated mixture to moulds of the desired shape and size comprising a non-interacting and non-stick surface including aluminium, Teflon, metal, HDPE, polycarbonate, neoprene, rubber, LDPE, glass and the like; (ii) depositing the aerated mixture into cavities imprinted in dry granular starch contained in a shallow tray, otherwise known as starch moulding forming technique; and (iii) depositing the aerated mixture onto a continuous belt or screen comprising any non-interacting or non-stick material Teflon, metal, HDPE, polycarbonate, neoprene, rubber, LDPE, glass and the like which may be later stamped, cut, embossed or stored on a roll.
- the drying of the formed aerated wet processing mixture may be accomplished by any suitable means including, but not limited to (i) drying room(s) including rooms with controlled temperature and pressure or atmospheric conditions; (ii) ovens including non-convection or convection ovens with controlled temperature and optionally humidity; (iii) Truck/Tray driers, (iv) multi-stage inline driers; (v) impingement ovens; (vi) rotary ovens/driers; (vii) inline roasters; (viii) rapid high heat transfer ovens and driers; (ix) dual plenum roasters, and (x) conveyor driers, and combinations thereof. Any suitable drying means that does not comprise freeze-drying can be used.
- the drying temperature may range from about 40°C to about 200°C.
- the drying environment is heated to a temperature between 100°C and 150°C.
- the drying temperature is between 105°C and 145°C.
- the drying temperature is between 110°C and 140°C.
- the drying temperature is between 115°C and 135°C.
- Suitable drying environments include "volumetric heating” techniques using high frequency electromagnetic fields such as Microwave Drying and Radio Frequency (RF) Drying. With these techniques, the energy is transferred electromagnetically through the aerated wet pre- mixture rather than by conduction or convection.
- RF Radio Frequency
- Optional ingredients may be imparted during any of the above described four processing steps or even after the drying process.
- the preparation of the surface resident coating comprising the cationic surfactant conditioner active may include any suitable mechanical or otherwise physical means to produce a particulate composition comprising the cationic surfactant conditioner active as described herein.
- the pure cationic surfactant material in either pellet or granular or other solid-based form (and comprising any minor impurities as supplied by the supplier including residual solvents and plasticizers) is ground into a fine powder via a variety of mechanical means, for instance in a grinder.
- inert fillers within the grinding process, for instance aluminum starch octenylsuccinate under the trade name DRY-FLO® PC and available from Akzo Nobel DryFlow® starch, at a level sufficient to improve the flow properties of the powder and to mitigate inter-particle sticking or agglomeration during powder production or handling.
- inert fillers for instance aluminum starch octenylsuccinate under the trade name DRY-FLO® PC and available from Akzo Nobel DryFlow® starch, at a level sufficient to improve the flow properties of the powder and to mitigate inter-particle sticking or agglomeration during powder production or handling.
- Other optional excipients or cosmetic actives, as described herein can be incorporated into the powder during the grinding process.
- the resulting powder may also be blended with other inert powders, either of inert materials or other powder-active complexes as described herein.
- any suitable application method can be used to apply the surface resident coating comprising the cationic surfactant conditioner active to the porous dissolvable solid substrate such that it forms a cationic conditioner active as part of the personal care article.
- the porous dissolvable solid substrate can have a tacky surface by drying the dissolvable porous solid to a specific water content) before application of powder to facilitate the adherence of the surface resident coating comprising the cationic surfactant conditioner active to the porous dissolvable solid substrate.
- the dissolvable porous solid substrate is dried to a moisture content of from about 0.1 % to about 25%, in one embodiment from about 3% to about 25%, in another embodiment from about 5% to about 20% and in yet another embodiment from about 7% to about 15%.
- a previously-dried porous dissolvable solid substrate's surface can be made to reversibly absorb a controlled level of atmospheric moisture prior to application of the powder within a controlled humidity environment for a specific period of time until equilibrium is achieved.
- the humidity environment is controlled from about 20% to about 85% relative humidity; in another embodiment, from about 30% to about 75% relative humidity; and in yet another embodiment, from about about 40% to about 60% relative humidity.
- the porous dissolvable solid substrate is placed in a bag, tray, belt, or drum containing or otherwise exposed to the powder and agitated, rolled, vibrated or shaken to apply and distribute the powder, either in a batch or continuous production manner.
- the surface resident coating comprising the cationic surfactant conditioner active can be applied over portions or entire regions of the porous dissolvable solid substrate's exterior surface, and can be applied in a manner to adorn, decorate, form a logo, design, etc.
- the personal care article of present invention has a Dissolution Rate that allows the personal care article to rapidly disintegrate during use application with water.
- the Dissolution Rate of the personal care article is determined in accordance with the methodology described below.
- Hand Dissolution Method 0.5 to 1.5 g (approximately 10 to 20 square centimeters if in a 3 to 10mm thick sheet/pad form) of the personal care article (as described in the examples herein) is placed in the palm of the hand while wearing nitrile gloves. 7.5 cm 3 of warm tap water (from about 30°C to about 35°C) is quickly applied to the personal care composition via syringe. Using a circular motion, palms of hands are rubbed together 2 strokes at a time until dissolution occurs (up to 30 strokes). The hand dissolution value is reported as the number of strokes it takes for complete dissolution or as 30 strokes as the maximum. For the latter scenario, the weight of the undissolved material is also reported.
- the personal care articles of the present invention have a hand dissolution value of from about 1 to about 30 strokes, in one embodiment from about 2 to about 25 strokes, in another embodiment from about 3 to about 20 strokes, and in still another embodiment from about 4 to about 15 strokes.
- the thickness of the personal care article and/or the porous dissolvable solid substrate is obtained using a micrometer or thickness gage, such as the Mitutoyo Corporation Digital Disk Stand Micrometer Model Number IDS-1012E (Mitutoyo Corporation, 965 Corporate Boulevard, Aurora, IL, USA 60504).
- the micrometer has a 1 inch diameter platen weighing about 32 grams, which measures thickness at an application pressure of about 40.7 phi (6.32 gm/cm 2 ).
- the thickness of the personal care article and/or the porous dissolvable solid substrate is measured by raising the platen, placing a section of the sample on the stand beneath the platen, carefully lowering the platen to contact the sample, releasing the platen, and measuring the thickness of the sample in millimeters on the digital readout.
- the sample should be fully extended to all edges of the platen to make sure thickness is measured at the lowest possible surface pressure, except for the case of more rigid samples which are not flat. For more rigid samples which are not completely flat, a flat edge of the sample is measured using only one portion of the platen impinging on the flat portion of the sample.
- the thickness is taken as the maximum distance of the shortest dimension, i.e., the diameter of a sphere or cylinder for instance, and the thickness ranges are the same as described above.
- the Basis Weight of the personal care article and/or the porous dissolvable solid substrate is calculated as the weight of the personal care article and/or the porous dissolvable solid substrate per area of the selected personal care article and/or the porous dissolvable solid substrate (grams/m 2 ).
- the area is calculated as the projected area onto a flat surface perpendicular to the outer edges of the personal care article and/or the porous dissolvable solid substrate. For a flat object, the area is thus computed based on the area enclosed within the outer perimeter of the sample. For a spherical object, the area is thus computed based on the average diameter as 3.14 x (diameter/2) 2 .
- the area is thus computed based on the average diameter and average length as diameter x length.
- the area is computed based on the side with the largest outer dimensions projected onto a flat surface oriented perpendicularly to this side. This can be accomplished by carefully tracing the outer dimensions of the sample onto a piece of graph paper with a pencil and then computing the area by approximate counting of the squares and multiplying by the known area of the squares or by taking a picture of the traced area (preferably shaded-in for contrast) including a scale and using image analysis techniques.
- the density of the personal care article and/or the porous dissolvable solid substrate described herein can be characterized in terms of a density determination.
- the personal care article and/or the porous dissolvable solid substrate of the present invention have a high degree of cell inter-connectivity, i.e., are predominantly open-celled solid foams as opposed to being predominantly closed-cell solid foams.
- the cell inter-connectivity can be assessed by light microscopy, scanning electron microscopy, micro computed tomography imaging parameters (Star Volume and SMI Index), gas pyncnometry parameters (% Open Cells), or other suitable methodology.
- a qualitative method of determining cell inter-connectivity is via light microscopy. This is performed by cutting a 2-3 mm wide sliver of the personal care article and/or the porous dissolvable solid substrate in the z-direction using scissors or a sharp blade, measured across the normal x-y largest surface, and turning the resulting sliver by 90 degrees to reveal the internal cellular structure of the freshly cut cross-sectional area.
- This cross-sectional area can be assessed by close visual inspection or, more accurately, by employing magnification under a stereo microscope such as the SZX12 Stereo microscope available from Olympus Olympus America Inc., Center Valley, PA.
- the open-celled personal care article and/or the porous dissolvable solid substrate of the present invention can easily be identified by examining the inner portion of the cross-sectional area which will comprise a predominantly three dimensional network of struts with open void spaces surrounding the struts that are inter-connected to one another including in the third dimension through the depth of the cross-section.
- the inner cross-section of a closed-cell foam will appear as discrete bubbles that are cut across and then only being interconnected at the cross-sectional surface in two dimensions by virtue of the cutting process employed to generate the exposed cross-sectional area.
- Disk-like samples approximately 4 cm in diameter and 3 to 7 mm high, are scanned using a micro computed tomography system ( ⁇ 80, SN 06071200, Scanco Medical AG). Each sample is imaged while sitting flat on the bottom of a cylindrical tube. Image acquisition parameters are 45 kVp, 177 ⁇ , 51.2 mm field of view, 800 ms integration time, 1000 projections. The number of slices is adjusted to cover the height of the sample. The reconstructed data set consisted of a stack of images, each 2048x2048 pixels, with an isotropic resolution of 25 ⁇ . For data analysis, a volume of interest is selected to be fully within the sample, avoiding the surface region. A typical volume of interest is 1028x772x98 voxels.
- SMI Structure Model Index
- SMI relates to the convexity of the structure to a model type.
- Ideal (flat) plates have an SMI of 0 (no surface change with dilation of the plates), whereas ideal cylindrical rods have an SMI of 3 (linear increase in surface with dilation of rods).
- Round spheres have an SMI of 4.
- Concave structure gives negative dBS/dr, resulting in negative SMI values. Artificial boundaries at the edge of the volume of interest are not included in the calculation and thus suppressed.
- Star Volume is a measure of the "openness" of the void space in a two phase structure.
- a random uniformly distributed set of points in the phase of interest in our case this is the background
- the lines are extended until they touch the foreground phase.
- the length of each of these lines is then recorded.
- the random points have a sampling of 10 in each direction (x/y/z) and at each point 10 random angles are chosen. If the line extends to the border of the ROI of interest that line is discarded (we only want to accept lines that actually intersect with the foreground phase).
- the final equation is based upon the research published in Star volume in bone research.
- the Percent Open Cell Content is measured via gas pycnometry.
- Gas pycnometry is a common analytical technique that uses a gas displacement method to measure volume accurately. Inert gases, such as helium or nitrogen, are used as the displacement medium. The sample is sealed in the instrument compartment of known volume, the appropriate inert gas is admitted, and then expanded into another precision internal volume. The pressure before and after expansion is measured and used to compute the sample volume. Dividing this volume into the sample weight gives the gas displacement density.
- ASTM Standard Test Method D2856 provides a procedure for determining the percentage of open cells using an older model of an air comparison pycnometer. This device is no longer manufactured. However, you can determine the percentage of open cells conveniently and with precision by performing a test which uses Micromeritics' AccuPyc Pycnometer.
- the ASTM procedure D2856 describes 5 methods (A, B, C, D, and E) for determining the percent of open cells of foam materials.
- the samples can be analyzed using an Accupyc 1340 using nitrogen gas with the ASTM foampyc software.
- Method C of the ASTM procedure is to be used to calculate to percent open cells. This method simply compares the geometric volume as determined using calipers and standard volume calculations to the true volume as measured by the Accupyc. It is recommended that these measurements be conducted by Micromeretics Analytical Services, Inc. (One Micromeritics Dr, Suite 200, Norcross, GA 30093). More information on this technique is available on the Micromeretics Analytical Services web sites (www.particletesting.com or www.micromeritics.com), or published in a book, "Analytical Methods in Fine particle Technology", by Clyde Orr and Paul Webb.
- the Cell Wall Thickness of the personal care article and/or the porous dissolvable solid substrate is computed from the scanned images via a micro computed tomography system ( ⁇ 80, SN 06071200, Scanco Medical AG) as described herein.
- the Cell Wall Thickness is determined according to the method defined for the measurement of Trabecular Thickness using Scanco Medical's Bone Trabecular Morphometry evaluation.
- Trabecular Thickness uses a Euclidean distance transformation (EDM), which calculates the Euclidean distance from any point in the foreground to the nearest background point.
- EDM Euclidean distance transformation
- the Trabecular Thickness measure represents twice the centerline values associated with the local maxima of the EDM, which represents the distance to the center of the object (twice this distance will yield the thickness).
- the Specific Surface Area of the personal care article and/or the porous dissolvable solid substrate is measured via a gas adsorption technique.
- Surface Area is a measure of the exposed surface of a solid sample on the molecular scale.
- the BET (Brunauer, Emmet, and Teller) theory is the most popular model used to determine the surface area and is based upon gas adsorption isotherms.
- Gas Adsorption uses physical adsorption and capillary condensation to measure a gas adsorption isotherm. The technique is summarized by the following steps; a sample is placed in a sample tube and is heated under vacuum or flowing gas to remove contamination on the surface of the sample. The sample weight is obtained by subtracting the empty sample tube weight from the degassed sample + sample tube weight.
- the sample tube is then placed on the analysis port and the analysis is started.
- the first step in the analysis process is to evacuate the sample tube, followed by a measurement of the free space volume in the sample tube using helium gas at liquid nitrogen temperatures.
- the sample is then evacuated a second time to remove the helium gas.
- the instrument then begins collecting the adsorption isotherm by dosing krypton gas at user specified intervals until the requested pressure measurements are achieved.
- Sample Preparation A sample not adequately cleaned of adsorbed contaminants will outgas during an analysis and some portion of the surface will be inaccessible to measurement. The purpose of degassing is to remove these adsorbed molecules from the surface of the sample prior to analysis. Adsorptive molecules must reach all parts of the surface for the true surface area to be revealed. Samples are prepared by heating the sample while simultaneously evacuating the sample tube.
- the samples are outgassed under evacuation at room temperature overnight. Samples may then analyzed using an ASAP 2420 with krypton gas adsorption. Krypton gas is preferred over nitrogen gas as it has a saturation pressure approximately 1/300 that of nitrogen at liquid nitrogen temperature (krypton: 2.5 torr; nitrogen: 760 torr). Therefore, compared to nitrogen, there is in the free space above the sample about 1/300 the number of krypton molecules present at the same relative pressure. Since about the same number of krypton and nitrogen molecules are required to form a monolayer, this number represents a far greater proportion of the quantity dosed than in the case of nitrogen. These measurements can be conducted by Micromeretics Analytical Services, Inc.
- the presence of a surface resident coating comprising a cationic surfactant conditioning active of the present invention can be determined by a number of techniques.
- the surface of application as well as the cross-sections perpendicular to the larger surfaces of the porous dissolvable solid substrate can be examined by microscopic techniques. These microscopic techniques may include light microscopy and scanning electron microscopy (SEM). The light microscopy may include but are not necessarily limited to bright field, dark field, or confocal microscopy techniques. Other techniques for mapping unique elements such as silicon or distinctive functional groups such as quaternary ammonium groups on the cross-sectional surface include: time of flight secondary ion mass spectroscopy (ToF-SIMS), or infrared microscopy.
- TOF-SIMS time of flight secondary ion mass spectroscopy
- micro- Computed Tomography micro-CT
- Magnetic Resonance Imaging MRI
- Acoustic Imaging Confocal Fluorescence Microscopy, Confocal Raman Spectroscopy, and Confocal Infrared Reflectance Spectroscopy.
- the determination of surface-resident coating particles on cross-sectioned porous dissolvable solid substrate can be performed by comparing the distribution of the particles across the cut cross-section of the porous solid.
- the surface resident coating particles should be present at the original solid/air interfaces, but not within the exposed cross sectioned interior of the solid cell walls as can be ascertained by analyzing the exposed freshly cut cross- sectional interiors of the solid. It should be noted that some contamination of the freshly cut cross-sectional solid cell wall interiors may occur as a consequence of the cutting process of the porous solid. However, the preponderance (in one embodiment, from about 50% to about 100%) of the surface resident coating particle distribution will occur at the original solid/air interfaces and not within the exposed cut cross-sectional interiors of the cell walls.
- the surface resident coating particles of the present invention generally do not spread uniformly across all exposed solid/air interfaces. Rather, it has been found that the surface resident coatings of the present invention typically spread, from the point of coating application, into cavities down to about 0.5 to about 3.0 mm according to gravity. Accordingly, the determination of surface resident particles of cosmetic actives of the present invention (as described above), should be conducted across many different cross sections from top-to-bottom and from edge-to-edge of the porous solid. If present, the surface resident cosmetic active particle will generally be within the regional vicinity (to within about 0.5 to about 3.0 mm from the surface) of the surface to where the cosmetic active was first applied. I. Wet and Dry Combing Evaluation
- the wet and dry combing performance is assessed using a qualitative panel of 10 trained graders. Two controls are included in each test encompassing applying a clarifying shampoo (Pantene Pro-V Clarifying Shampoo, distributed by Procter & Gamble, Cincinnati OH) and a two step application of the same clarifying shampoo followed by application of a separate hair conditioner (Pantene Pro-V Always Smooth Conditioner, distributed by Procter & Gamble, Cincinnati OH). In a typical test 8 separate formulations can be assessed for their performance relative to the controls.
- the substrate is virgin brown hair obtainable from a variety of sources that is screened to ensure uniformity and lack of meaningful surface damage.
- the protocol used to apply the clarifying shampoo control is the protocol used to apply the clarifying shampoo control.
- the conditioner is subsequently applied in the same manner as the clarifying shampoo above, but the conditioner application is only done once and not repeated as in the case for the clarifying shampoo.
- wet and dry combing evaluations are obtained using trained graders.
- the above freshly prepared wet switches are stored within aluminum foil until just prior to wet combing grading.
- the switches are hung on a metal rod rack with one switch from each treatment included in the grading set.
- Two consumers are asked to grade each switch with the first consumer firstly detangling the wet switch with the narrow end of a narrow tooth nylon comb (typical of those used by consumers) prior to combing evaluation.
- the graders are asked to compare the treatments (labeled A through J) for wet combing by combing the switch with the nylon comb in a downward manner and rate the ease/difficulty of combing on a zero to ten point scale.
- the graders are informed of which two treatments represent the controls (A & B) prior to the evaluation for calibration purposes.
- the order of the treatments (A through J) are randomized between the differing graders.
- the grades are averaged across the 10 consumers for each treatment to give the average and 95% confidence groupings are then computed from the means employing Fisher's lease significant difference (LSD) procedure via the Stat AdvisorTM feature of Statgraphics software (Statpoint Technologies, Inc., Warrenton, VA).
- the means are then computed as a normalized percentage by the following equation:
- the hair switches are then moved into a controlled temperature (hung on racks) and humidity room (72F/50% RH) and allowed to dry overnight.
- the graders are then asked to evaluate dry combing performance using the nylon comb for ease/difficulty of combing on a zero to ten point scale in an analogous manner to the above wet combing evaluations.
- the grading data is computed and analyzed as described above for the wet combing data.
- the personal care article and/or the porous dissolvable solid substrate provide a lather profile as described hereafter.
- the lather volume assessment is performed on 15g/10 inch flat Oriental virgin hair switches that have been treated with 4.5ml of 100% coconut oil.
- the hair switch is rinsed with 9-11 grain, 100°F water at 1.5 gallons/min for 20 seconds with a shower nozzle.
- 0.75 cm 3 of liquid product are applied to the center of the switch, the lower portion of hair on the switch is then rubbed over the product on the hair 10 times in a circular motion, followed by 40 strokes back and forth (a total of 80 strokes).
- Lather speed is recorded as the number of strokes when the first lather is obviously generated during the 80 strokes.
- Lather from operator's gloves is transferred to a graduated cylinder with a 3.5 cm inside diameter and with total capacities of either 70 ml, 110 ml, or 140 ml depending on the total amount of lather generated (height modification of standard sized graduated cylinders via a glass shop).
- Lather from hair is gathered using one downward stroke on the switch with a tight grip and is also placed into the cylinder. Total lather volume is recorded in milliliters. Three runs per test sample are performed and the mean of the three values is calculated.
- the appropriate weight of the solid is weighed with the aid of scissors and applied to the switch and then 1.25 cm 3 of additional water is added to the product while on the switch via a syringe prior to stroking.
- the hair switches are cut for deposition testing. Silicone is extracted from 1.5g of hair with 6 mL of 50:50 toluene: methylisobutyl ketone in 20 mL scintillation vials. The vials are agitated on a pulsed vortexer for 30 minutes. The silicone of the extract is quantified using inductively coupled plasma optical emission spectrometry (ICP-OES). ICP calibration standards of known silicone concentration are made using the same or a structurally comparable type of silicone raw material as the products being tested. The working range of the method is 8 - 2300 ⁇ g silicone per gram of hair.
- ICP-OES inductively coupled plasma optical emission spectrometry
- the hair switches are cut for deposition testing. Quaternary surfactant is extracted from 1.5g of hair with 15 mL of 20:20:60 methylisobutyl ketone: methanol: hexane in 20 mL scintillation vials. The vials are agitated on a pulsed vortexer for 30 minutes. 500 ⁇ ⁇ of the extracts are transferred to 2 mL autosampler vials and evaporated to dryness under a gentle stream of nitrogen. The samples are reconstituted with 100 ⁇ ⁇ of methanol.
- Quaternary surfactant in the extracts is quantified using reversed phase HPLC on a Waters XBridge C8 column with a trifluoroacetic acid/methanol gradient and evaporative light scattering detection. Calibration standards of known quaternary surfactant concentration are made using the same surfactant raw material as the products being tested. The working range of the method is roughly 50 - 500 ⁇ g quaternary surfactant per gram of hair.
- the hair switches are cut for deposition testing.
- Fatty alcohol is extracted from 1.5g of hair with 15 mL of 20:20:60 methylisobutyl ketone:methanol: hexane in 20 mL scintillation vials.
- the vials are agitated on a pulsed vortexer for 30 minutes.
- 1 mL of the extracts is transferred to 2 mL autosampler vials and evaporated to dryness under a gentle stream of nitrogen.
- the samples are reconstituted with 500 ⁇ ⁇ of Sylon BFT in dichloromethane.
- Fatty alcohol in the extracts is quantified using GC/FID with a nonadecanol internal standard and commercially available fatty alcohol standards.
- the working range of the method is roughly 6 - 6000 ⁇ g fatty alcohol per gram of hair. IV.
- compositions of the present invention may be used for treating mammalian keratinous tissue such as hair and/or scalp, and provide rapid rinse-ability.
- the method for conditioning the hair may comprise the steps of: a) applying an effective amount of the personal care product to the hand, b) wetting the personal care product with water and rubbing to dissolve the solid, c) applying the dissolved material to either the hair or scalp such as to treat, and d) rinsing the diluted treatment from the hair or scalp using water. These steps can be repeated as many times as desired to achieve the desired treatment benefit.
- surfactant/polymer liquid processing compositions are prepared at the indicated weight percentages as described below.
- Viscosity (cp) 35,400 1 Sigma-Aldrich Catalog No. 363081, MW 85,000-124,000, 87-89% hydrolyzed
- a target weight of 300 grams of the above composition is prepared using a conventional overhead stirrer (IKA® RW20DZM Stirrer available from IKA® Works, Inc., Wilmington, DE) and a hot plate (Corning Incorporated Life Sciences, Lowell, MA).
- the distilled water and glycerin are added into a vessel with stirring at 100-150 rpm.
- the cationic polymer, when present, is then slowly added with constant stirring until homogenous.
- the polyvinyl alcohol is weighed into a suitable container and slowly added to the main mixture in small increments using a spatula while continuing to stir while avoiding the formation of visible lumps. The mixing speed is adjusted to minimize foam formation.
- the mixture is slowly heated to 80°C after which surfactants are added.
- the mixture is then heated to 85 °C while continuing to stir and then allowed to cool to room temperature. Additional distilled water is added to compensate for water lost to evaporation (based on the original tare weight of the container).
- the final pH is between 5.2 - 6.6 and adjusted with citric acid or diluted sodium hydroxide if necessary. The resulting processing mixture viscosity is measured.
- An open-celled Porous Dissolvable Solid Shampoo Substrate was prepared from the liquid processing mixture from Examples 1 as described below.
- the density is measured by weighing a filling a cup with a known volume and evenly scraping off the top of the cup with a spatula.
- the resulting aerated mixture is then spread with a spatula into square 160 mm x 160 mm aluminum molds with a depth of 6.5 mm with the excess wet foam being removed with the straight edge of a large metal spatula that is held at a 45° angle and slowly dragged uniformly across the mold surface.
- the aluminum molds are then placed into a 130°C convection oven for approximately 35 to 45 minutes. The molds are allowed to cool to room temperature with the substantially dry porous solids removed from the molds with the aid of a thin spatula and tweezers.
- Each of the resulting 160 mm x 160 mm square pads is cut into nine 43 mm x 43 mm squares (with rounded edges) using a cutting die and a Samco SB20 cutting machine (each square representing surface area of approximately 16.9 cm 2 ).
- the resulting smaller pads are then equilibrated overnight (14 hours) in a constant environment room kept at 70°F and 50% relative humidity within large zip-lock bags that are left open to the room atmosphere.
- Each pad is then weighed and placed on an individual weight boat with the original mold side facing downward. The average pad weights are recorded and the basis weight computed by dividing the average pad weight by 0.00169 square meters.
- the resulting pad thickness is measured with a digital caliper and recorded.
- Two representative quaternized conditioner powders were prepared via grinding the original pellets within a small Black & Decker ® coffee mill with repeated pulses spanning 2 to 3 minutes (approximately 10 grams per powder preparation).
- the representative quaternized conditioners chosen include stearoyltrimethylammonium chloride (STMAC) and distearoyldimethylammonium chloride (DSDMAC) available from Clariant Corporation (Charlotte, North Carolina) as GENAMIN STAC and GENAMIN DSAP, respectively.
- STMAC stearoyltrimethylammonium chloride
- DMDMAC distearoyldimethylammonium chloride
- the former had an activity of approximately 79.1% and the latter of approximately 92.4% activity. Due to the increased stickiness of the latter GENAMIN DSAP it was mixed 80:20 with corn starch (available from National Starch as DRY-FLO PC) prior to being ground.
- Example 3 The above data and referenced images demonstrate the Porous Dissolvable Solid Shampoo Substrate of Example 3 to be predominantly open-celled and exhibits fast dissolution performance (6 to 8 strokes) within the simulated hand dissolution protocol as described herein.
- Example 5 Wet & Dry Combing and Deposition Data The wet & dry combing evaluations are conducted with relative comparisons being made to the i) one step Clarifying shampoo control and ii) 2 step Clarifying shampoo plus separate hair conditioner control applications. To evaluate the influence of applied surface resident coatings of the quatemized powders from example 4 onto the Porous Dissolvable Solid Shampoo Substrate of example 3, it was assumed that two 16.9 square centimeter pads of the Porous Dissolvable Solid Shampoo Substrate (approximately 2 to 2.2 grams of solid shampoo per two squares) would constitute a single dose for application to 150 grams of hair.
- the respective STMAC and DSDMAC powders from Example 4 are then applied by carefully coating the exposed surfaces of the cut piece (an iterational process whereby additional powder is coated and excess powder is removed by shaking the solid piece with a spatula) with the desired amount of powder which is expressed as a weight percentage of the original 0.29g solid weight, e.g., powders applied at 7.1% of weight of solid corresponds to approximately 0.020 grams of powder being coated onto the 0.28 gram cut piece of solid shampoo (after the addition of 0.016 grams of aminosilicone).
- the 95% confidence groupings were computed from the means (prior to normalizing to a percentage) employing Fisher' s lease significant difference (LSD) procedure via the StatAdvisorTM feature of Statgraphics software (Statpoint Technologies, Inc., Warrenton, VA). The deposition data was measured as described herein.
- LSD lease significant difference
- the above data demonstrates single variably that imparting a quaternary conditioner as a surface resident powder coating (at all levels tested - see legs 5a - 5e) results in a significant improvement in both wet and dry conditioning relative to the original Porous Dissolvable Solid Shampoo Substrate (See Tables 3 and 4).
- the deposition data in Table 3 also demonstrate that the presence of the surface resident powder coatings of the quaternary conditioners results in significant levels of deposited quaternary conditioner onto the hair after treatment (See Table 5).
- the data demonstrates that strong hair conditioning performance can be achieved with a single step shampoo application and the conditioning benefit can approach the performance of the 2 step shampoo plus separate conditioner control (between about 40% to about 99% of the performance).
- Example 6 Hair Switch Lather Evaluations of Porous Dissolvable Solid Substrate with Applied Quaternized Conditioner Surface Resident Coatings
- the hair switch lather evaluations are conducted with relative comparisons being made to the appropriate retail 2-in-l conditioning shampoo (Pantene Pro-V Smooth and Sleek).
- Pantene Pro-V Smooth and Sleek 2-in-l conditioning shampoo
- the DSDMAC powder from Example 4 is then applied by coating the exposed surfaces of the cut piece (an iterational process whereby additional powder is coated and excess powder is removed by shaking the solid piece with a spatula) with the desired amount of powder which is expressed as a weight percentage of the original 0.165g solid weight, e.g., powders applied at 5.5% of weight of solid corresponds to approximately 0.009 grams of powder being coated onto the 0.165 gram cut piece of solid shampoo (after the addition of 0.009 grams of aminosilicone).
- the deposition data was measured as described herein.
- Example 7 Hand Dissolution Evaluation of Porous Dissolvable Solid Substrate with Applied Quaternized Conditioner Surface Resident Coatings
- the hand dissolution evaluations are conducted as described herein. To evaluate the influence of applied surface resident coatings of the quaternized powders from example 4 onto the Porous Dissolvable Solid Shampoo Substrate of example 3, it was assumed that one 16.9 square centimeter pad of the Porous Dissolvable Solid Shampoo Substrate (approximately 1.1 grams of solid shampoo per square) would be dissolved in one hand prior to application to the hair by the simulated addition of water to the top of the pad by the other hand that is cupped and filled with water.
- the DSDMAC powder from Example 4 is then applied to some of the pads as noted in the table below by coating the exposed surfaces of the pad (by dipping both sides of the pad into the free powder within a weigh boat and shaking off the excess powder until the desired weight is achieved) until 0.06 grams of DSDMAC powder is deposited as a coating which is approximately 5.5 % by weight of the original solid pad.
Abstract
Description
Claims
Priority Applications (5)
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EP10795144.4A EP2509563B1 (en) | 2009-12-08 | 2010-12-08 | A porous, dissolvable solid substrate and a cationic surfactant conditioner material |
JP2012539091A JP5678081B2 (en) | 2009-12-08 | 2010-12-08 | Method for manufacturing personal care article |
MX2012006249A MX2012006249A (en) | 2009-12-08 | 2010-12-08 | A porous, dissolvable solid substrate and a cationic surfactant conditioner material. |
BR112012013835A BR112012013835A2 (en) | 2009-12-08 | 2010-12-08 | "dissolvable porous solid substrate and cationic surfactant conditioning material". |
CN201080055680.7A CN102647974B (en) | 2009-12-08 | 2010-12-08 | Porous, dissolvable solid substrate and cationic surfactant conditioner material |
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US26767709P | 2009-12-08 | 2009-12-08 | |
US61/267,677 | 2009-12-08 |
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US (1) | US8349787B2 (en) |
EP (1) | EP2509563B1 (en) |
JP (1) | JP5678081B2 (en) |
CN (1) | CN102647974B (en) |
BR (1) | BR112012013835A2 (en) |
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BR112012013835A2 (en) | 2019-09-24 |
MX2012006249A (en) | 2012-06-19 |
CN102647974A (en) | 2012-08-22 |
JP5678081B2 (en) | 2015-02-25 |
JP2013510888A (en) | 2013-03-28 |
CN102647974B (en) | 2014-03-12 |
EP2509563A1 (en) | 2012-10-17 |
US20110189246A1 (en) | 2011-08-04 |
EP2509563B1 (en) | 2016-03-30 |
US8349787B2 (en) | 2013-01-08 |
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